This shows chargeable ISP traffic for the whole campus. Except during July and August, the peak is set by Resnet between 11 p.m. and 1 a.m. so Resnet's 95th percentile is the same as for the campus. Chargeable traffic is most often inbound. For September and October it was outbound because of problems blocking high bandwidth users in the Perfigo.
UCSC's ISP comittment is 100 Mb/s.  We are liable for a ready
to serve charge to the extent that we don't meet our purchase
comittment.  We received our first such charge for the month
of December amounting to $215 (2 percent of $9404).

The rules do not permit us to set a comittment lower than last
year's usage.  There has been a substantial shift in use pattern
away from "commercial" service to free or fixed cost services.
The decline in commercial demand is enough that the packeteer
setting is higher than the demand.  The Packeteer protects us
against an eventuality that now is rare.  We can think of two
reasons for this:

  1.  CENIC has arranged for free exchange of traffic with 
an increasing number of peer networks.  Last year we disposed
of 25 percent of our traffic in cost-free peer exchanges.  
This year, cost-free peering dispatches half our traffic.

  2.  Users seek good performance.  They gravitate toward 
peer-to-peer file networks that use Internet-2.    While that 
doesn't help them fend off the 2-gig limit, it does improve 
performance a lot.  That steers traffic toward the low cost path.

The growth of cost-free peering last year as 100 percent.  Much
of this has been at the expense (bad pun) of commercial service.
We cannot rely on these trends to remain stable.  The traffic
could shift back.

The budget estimate for Resnet traffic was $150,000 for the current
FY.  The year is half over and if current use holds through June,
our estimate is that Resnet's share of these charges will be $105,000.